Donald Trump's Predict it contract spiked more than 30 percent, while Hillary Clinton's fell more than 10 percent after the FBI letter.
The emails were discovered during an investigation related to former Congressman Anthony Weiner, The New York Times reported.
The Democratic presidential nominee talked about drug costs, student debt and flooding, but not the FBI taking a look at newly discovered emails.
Donald Trump seized on the news Friday that the FBI is probing new emails related to Hillary Clinton's private server.
Markets got a jolt Friday afternoon when it was revealed that the Federal Bureau of Investigation is looking at new emails related to Hillary Clinton.
"That's not a good story for markets, for the country. This could drag on for months and months," says one expert.
The currency fell more than 1 percent against the U.S. dollar after news that the FBI is investigating new emails related to Hillary Clinton.
News of the re-opened Clinton email probe now gives Trump a winning hand to play in this tumultuous election, says Jake Novak.
The market has been trading in an ultra-tight range, but more movement could be bubbling beneath the market's surface.
Oil prices edged lower Friday on doubts about OPEC's first planned output cut in eight years.
Half of the people who buy health plans through government-run Obamacare marketplaces are cutting back on care to manage costs.
Just three months ago Carnegie Mellon University's Vivek Wadhwa told CNBC that "Twitter is toast." Twitter's world looks very different now.
Deutsche Bank told clients to buy shares of Twitter now that the stock appears to have bottomed after falling 22 percent in the past month.
A look under the hood shows that the U.S. is likely stuck in the same growth trap in which it has found itself since the Great Recession ended.
How Indra Nooyi and Hugh Johnston disagree without spooking their staff or their investors.
A normally red state, Arizona has emerged in 2016 as a presidential battleground.
A president can set an overall tone but earnings generally drive the stock market, says LPL Financial's John Canally.
Google is keeping investors happy, but Alphabet's moonshots are dealing with heavy executive turnover.
While Starbucks' famous holiday cups aren't due out until November, a barista appears to have pulled back the lid and revealed the newest design.